(x-1)²+a(x-1)+b=x²-2x+1+ax-a+b=x²+(a-2)x+1-a+b=x²+3x+2所以:(a-2)=31-a+b=2解得:a=5,b=6
x²+3x+2=(x-1)²+a(x-1)+b=x²-2x+1+ax-a+b=x²+(a-2)x+(1+b-a)∴﹛a-2=3 1+b-a=2∴a=5, b=6a+b=5+6=11
x²+3x+2=(x-1)²+a(x-1)+b令x=2则4+6+2=1+a+ba+b=11